<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/welcome' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>分类参数</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card class="box-card">
      <!-- 警告 -->
      <el-alert title="注意：只允许为第三级分类设置相关参数！" type="warning" show-icon :closable="false"></el-alert>

      <!-- 选择商品分类 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader
            v-model="selectedCateKeys"
            :options="cateList"
            :props="{ 
              expandTrigger: 'hover',
              value: 'cat_id',
              label: 'cat_name',
              children: 'children'
            }"
            @change="handleChange"
          ></el-cascader>
        </el-col>
      </el-row>

      <!-- 标签页 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数面板 -->
        <el-tab-pane label="动态参数" name="many">
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible=true"
          >添加参数</el-button>
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染 tag 标签 -->
                <el-tag
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleClose(i, scope.row)"
                >{{item}}</el-tag>
                <!-- 输入文本框 -->
                <!-- scope.row 一行的数据 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                ></el-input>
                <!-- 添加按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                >+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  type="primary"
                  icon="el-icon-edit"
                  size="mini"
                  @click="showEditDialog(scope.row.attr_id)"
                >编辑</el-button>
                <el-button
                  type="danger"
                  icon="el-icon-delete"
                  size="mini"
                  @click="removeParams(scope.row.attr_id)"
                >删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性面板 -->
        <el-tab-pane label="静态属性" name="only" :disabled="isBtnDisabled">
          <el-button type="primary" size="mini" @click="addDialogVisible=true">添加属性</el-button>
          <!-- 静态属性表格 -->
          <el-table :data="onlyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染 tag 标签 -->
                <el-tag
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleClose(i, scope.row)"
                >{{item}}</el-tag>
                <!-- 输入文本框 -->
                <!-- scope.row 一行的数据 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                ></el-input>
                <!-- 添加按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                >+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  type="primary"
                  icon="el-icon-edit"
                  size="mini"
                  @click="showEditDialog(scope.row.attr_id)"
                >编辑</el-button>
                <el-button
                  type="danger"
                  icon="el-icon-delete"
                  size="mini"
                  @click="removeParams(scope.row.attr_id)"
                >删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- 添加参数的对话框 -->
    <el-dialog
      :title="'添加'+ titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed"
    >
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改参数的对话框 -->
    <el-dialog
      :title="'修改'+ titleText"
      :visible.sync="EditDialogVisible"
      width="50%"
      @close="EditDialogClosed"
    >
      <el-form :model="EditForm" :rules="EditFormRules" ref="EditFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="EditForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="EditDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="EditParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      cateList: [],
      // 级联选择框双向绑定到的数组
      selectedCateKeys: [],
      // 被激活的页签的名称
      activeName: 'many',
      // 动态参数的数据
      manyTableData: [],
      // 静态属性的数据
      onlyTableData: [],
      addDialogVisible: false,
      // 添加参数的表单数据对象
      addForm: {
        attr_name: ''
      },
      // 校验规则
      addFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      },
      EditDialogVisible: false,
      // 修改参数的表单数据对象
      EditForm: {},
      EditFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      },
      // 控制按钮与文本框的切换显示
      inputVisible: false,
      // 文本框中输入的内容
      inputValue: ''
    }
  },
  created() {
    // 获取所有的商品分类
    this.getCateList()
  },
  methods: {
    async getCateList() {
      const { data: res } = await this.$axios.get('/categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败')
      }
      this.cateList = res.data
      console.log(this.cateList)
    },
    // 级联选择框选中项变化, 会触发这个函数
    handleChange() {
      this.getParamsData()
    },
    // tab页签 点击事件的处理函数
    handleTabClick() {
      console.log(this.activeName)
      this.getParamsData()
    },
    // 获取参数的列表数据
    async getParamsData() {
      // 证明选中的不是三级分类
      if (this.selectedCateKeys.length !== 3) {
        // 清空
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      // 选中的是三级分类
      // console.log(this.selectedCateKeys)
      const { data: res } = await this.$axios.get(
        `/categories/${this.cateId}/attributes`,
        {
          params: { sel: this.activeName }
        }
      )
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败')
      }

      res.data.forEach(item => {
        // console.log(item)
        // 判断 item.attr_vals 是否是空字符串
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        // 控制文本框的显示与隐藏
        item.inputVisible = false
        // 文本框中输入的值
        item.inputValue = ''
      })
      console.log(res.data)

      if (this.activeName == 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    // 重置表单
    addDialogClosed() {
      this.$refs.addFormRef.resetFields()
    },
    // 添加参数
    addParams() {
      // 表单验证
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$axios.post(
          `/categories/${this.cateId}/attributes`,
          {
            attr_name: this.addForm.attr_name, // 属性名称
            attr_sel: this.activeName // 切换属性
          }
        )
        console.log(res)
        if (res.meta.status !== 201) {
          return this.$message.error('添加参数失败')
        }
        this.$message.success('添加参数成功')
        this.addDialogVisible = false
        // 刷新列表
        this.getParamsData()
      })
    },
    // 修改参数
    async showEditDialog(attr_id) {
      // 查询当前参数的信息
      const { data: res } = await this.$axios.get(
        `/categories/${this.cateId}/attributes/${attr_id}`,
        {
          params: {
            attr_sel: this.activeName // 切换属性
          }
        }
      )
      console.log(res.data)
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数信息失败')
      }
      this.EditForm = res.data

      this.EditDialogVisible = true
    },
    EditDialogClosed() {
      this.$refs.EditFormRef.resetFields()
    },
    // 修改参数
    EditParams() {
      // 校验
      this.$refs.EditFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$axios.put(
          `/categories/${this.cateId}/attributes/${this.EditForm.attr_id}`,
          {
            attr_name: this.EditForm.attr_name,
            attr_sel: this.activeName
          }
        )
        if (res.meta.status !== 200) {
          return this.$message.error('修改参数失败')
        }
        this.$message.success('修改参数成功')
        this.getParamsData()
        this.EditDialogVisible = false
      })
    },
    // 根据 id 删除对应的参数项
    async removeParams(attr_id) {
      const confirmResult = await this.$confirm(
        '此操作将永久删除该参数, 是否继续?',
        '提示',
        {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }
      ).catch(err => err)
      // 用户取消删除
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除')
      }
      // 调用删除的逻辑
      const { data: res } = await this.$axios.delete(
        `/categories/${this.cateId}/attributes/${attr_id}`
      )
      if (res.meta.status !== 200) {
        return this.$message.error('删除参数失败')
      }
      this.$message.success('删除参数成功')
      this.getParamsData()
      this.EditDialogVisible = false
    },
    // 文本框失去焦点或enter都会触发
    handleInputConfirm(row) {
      // console.log('ok')
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        // 隐藏文本输入框
        row.inputVisible = false
        return
      }
      // 如果没有 return, 则证明输入的内容需要做处理
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      // 隐藏文本输入框
      row.inputVisible = false
      // 发起请求, 将结果保存在数据库中
      this.saveAttrVals(row)
    },
    // 将对 attr_vals 的操作保存到数据库
    async saveAttrVals(row) {
      // 发起请求, 将结果保存在数据库中
      const { data: res } = await this.$axios.put(
        `/categories/${this.cateId}/attributes/${row.attr_id}`,
        {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(' ')
        }
      )
      if (res.meta.status !== 200) {
        return this.$message.error('修改参数项失败')
      }
      this.$message.success('修改参数项成功')
    },
    showInput(row) {
      // 显示文本输入框
      row.inputVisible = true
      // 让文本框自动获得焦点
      // $nextTick 的作用
      // 当页面被重新渲染之后, 才会指定回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 删除对应的参数可选性
    handleClose(i, row) {
      // 删除一项参数
      row.attr_vals.splice(i, 1)
      this.saveAttrVals(row)
    }
  },
  computed: {
    // 如果按钮需要禁用则返回 ture
    isBtnDisabled() {
      if (this.selectedCateKeys.length !== 3) {
        return true
      }
      return false
    },
    // 当前选中的三级分类的 id
    cateId() {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      }
      return null
    },
    // 动态计算标题的文本
    titleText() {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态属性'
    }
  }
}
</script>

<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
}
.el-tag {
  margin-right: 10px;
}
.input-new-tag {
  width: 90px;
}
</style>